public class Excel
{
/// <summary>
/// Import excel to datatable
/// </summary>
/// <param name="filePath">excel路径</param>
/// <param name="isColumnName">Whether the first row is a column name</param>
/// <returns>返回datatable</returns>
public static DataTable ExcelToDataTable(string filePath, bool isColumnName, int type = 0, int whethertitle = 0)
{
DataTable dataTable = null;
FileStream fs = null;
DataColumn column = null;
DataRow dataRow = null;
IWorkbook workbook = null;
ISheet sheet = null;
IRow row = null;
ICell cell = null;
int startRow = 0;
try
{
#region
if (type == 0)
{
using (fs = File.OpenRead(filePath))
{
// 2007 version
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003 version
else if (filePath.IndexOf(".xls") > 0)
workbook = new HSSFWorkbook(fs);
if (workbook != null)
{
sheet = workbook.GetSheetAt(0);//Read the first sheet, of course, you can also read each sheet in a loop
dataTable = new DataTable();
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//Total number of rows
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(0);//The first row
if (whethertitle > 0)
firstRow = sheet.GetRow(1);//The second row
int cellCount = firstRow.LastCellNum;//列数
// Build the columns of the datatable
if (isColumnName)
{
startRow = 1;//If the first row is a column name, start reading from the second row
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
cell.SetCellType (CellType.String);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
if (whethertitle > 0)
startRow = 2;
// fill row
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
dataRow = dataTable.NewRow();
bool flag = false;
if (row.FirstCellNum >= 0)
{
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
dataRow[j] = "";
else
{
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//Processing of time format (2015.12.5, 2015/12/5, 2015-12-5, etc.)
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
flag = true;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
flag = true;
break;
default:
dataRow[j] = row.GetCell(j).StringCellValue;
break;
}
}
}
}
if (flag)
dataTable.Rows.Add(dataRow);
}
}
}
}
}
}
#endregion
#region
else
{
using (fs = File.OpenRead(filePath))
{
// 2007 version
if (filePath.IndexOf(".xlsx") > 0)
workbook = new XSSFWorkbook(fs);
// 2003 version
else if (filePath.IndexOf(".xls") > 0)
workbook = new HSSFWorkbook(fs);
if (workbook != null)
{
sheet = workbook.GetSheetAt(0);//Read the first sheet, of course, you can also read each sheet in a loop
dataTable = new DataTable();
if (sheet != null)
{
int rowCount = sheet.LastRowNum;//Total number of rows
if (rowCount > 0)
{
IRow firstRow = sheet.GetRow(1);//The first row
if (whethertitle > 0)
firstRow = sheet.GetRow(1);//The second row
int cellCount = firstRow.LastCellNum;//列数
// Build the columns of the datatable
if (isColumnName)
{
startRow = 1;//If the first row is a column name, start reading from the second row
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
cell = firstRow.GetCell(i);
if (cell != null)
{
if (cell.StringCellValue != null)
{
column = new DataColumn(cell.StringCellValue);
dataTable.Columns.Add(column);
}
}
}
}
else
{
for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
{
column = new DataColumn("column" + (i + 1));
dataTable.Columns.Add(column);
}
}
startRow = 2;
if (whethertitle > 0)
startRow = 3;
// fill row
for (int i = startRow; i <= rowCount; ++i)
{
row = sheet.GetRow(i);
if (row == null) continue;
bool flag = false;
dataRow = dataTable.NewRow();
for (int j = row.FirstCellNum; j < cellCount; ++j)
{
cell = row.GetCell(j);
if (cell == null)
dataRow[j] = "";
else
{
//CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)
switch (cell.CellType)
{
case CellType.Blank:
dataRow[j] = "";
break;
case CellType.Numeric:
short format = cell.CellStyle.DataFormat;
//Processing of time format (2015.12.5, 2015/12/5, 2015-12-5, etc.)
if (format == 14 || format == 31 || format == 57 || format == 58)
dataRow[j] = cell.DateCellValue;
else
dataRow[j] = cell.NumericCellValue;
flag = true;
break;
case CellType.String:
dataRow[j] = cell.StringCellValue;
flag = true;
break;
}
}
}
if (flag)
dataTable.Rows.Add(dataRow);
}
}
}
}
}
}
#endregion
return dataTable;
}
catch (Exception ex)
{
if (fs != null)
{
fs.Close();
}
return null;
}
}
private string fileName = null; //file name
private IWorkbook workbook = null;
private FileStream fs = null;
private bool disposed;
public Excel(string filenames)
{
this.fileName = filenames;
disposed = false;
}
/// <summary>
/// Import datatable into excel
/// </summary>
/// <param name="dt">DataTable query data</param>
/// <param name="sheetName">表名</param>
/// <param name="isColumnName">Add table name</param>
/// <returns></returns>
public int DataTableToExcel(DataTable dt, string sheetName, bool isColumnName)
{
// NPOI.HSSF.UserModel.HSSFWorkbook workbook = new HSSFWorkbook();
fs = new FileStream(fileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
int count = 0; // number of rows
ISheet sheet = null;
/*================================================================================
if (fileName.IndexOf(".xlsx") > 0)
{
workbook = new XSSFWorkbook();
}
else
{
workbook = new HSSFWorkbook();
}
try
{
if (workbook != null)
{
//Create a table and give the Excel table name
sheet = workbook.CreateSheet(sheetName);
}
else
{
return -1;
}
if (isColumnName == true) //true add column name false do not add
{
//create the first row
IRow row = sheet.CreateRow(0);
// loop to fill the first row
for (int i = 0; i < dt.Columns.Count; ++i)
{
row.CreateCell(i).SetCellValue(dt.Columns[i].ColumnName);
}
count = 1;
}
//fill the data to remove the first row
for (int i = 0; i < dt.Rows.Count; ++i)
{
//create a row
IRow row = sheet.CreateRow(count);
// populate the data of the columns of the created row
for (int j = 0; j < dt.Columns.Count; ++j)
{
row.CreateCell(j).SetCellValue(dt.Rows[i][j].ToString());
}
count++;
}
workbook.Write(fs);
workbook.Close();
return count;
}
catch (Exception ex)
{
return -1;
}
}
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
protected virtual void Dispose(bool disposing)
{
if (!this.disposed)
{
if (disposing)
{
if (fs != null)
fs.Close();
}
fs = null;
disposed = true;
}
}
}
excel import and export
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